netscape, amazon, and google. when he listened to k.r., the idea seemed just as transformative. efficient, inexpensive, clean energy out of a box. but google... >> mm. >> 25 million. >> mm-hmm. >> this man said how much money? >> at the time, he said over $100 million. >> didn't smoke start coming out of your ears and--no? >> no. >> that was okay? >> that was okay. >> so nothing he said scared you? >> oh, i wasn't at all sure it could be done. >> but there was a selling point. clean energy was an emerging market worth gazillions. >> i like to say that the new energy technologies could be the largest economic opportunity of the 21st century. >> was this your very first-- >> clean energy investment? >> yeah. >> this was the very first. >> many followed, and the clean tech revolution in silicon valley was off and running with start-ups that produced thin, flexible solar panels, harnessed wind with giant balloons, or develop new fuels from algae. but bloom is among the most expensive. i heard, actually, so far, not just from kleiner perkins but total, $400 million. >> you're in the ballpark.